Zend certified PHP/Magento developer

Can’t change user folder Name om Windows 7 because it says that the folder is opened in another program

I’ve been following a guide here on how to change the Name and path of user folder (Rename profile folder on Windows 7/8 ) , but when i get to changing the Name in file Explorer it says that the folder is opened in another program. I don’t know how this is possible becouse i shut Down the pc before reloging and there is no proces in task manager form the other user.

(sorry for creating another thread but this 50 reputation system makes it so i cant just reply with this question to the originaly guide and forces me to create this)